Niemiec, Mark D. (2010). Game of Life Cellular Automata(en inglés). Springer-Verlag. pp. 115-134. doi:10.1007/978-1-84996-217-9_8. Fig. 8.12 en p. 129 depicts a closely-related synthesis with seven gliders and a block. The 8-glider synthesis combines two of the four-glider units described in this figure.
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Niemiec, Mark D. (2010). Game of Life Cellular Automata(en inglés). Springer-Verlag. pp. 115-134. doi:10.1007/978-1-84996-217-9_8. Fig. 8.12 en p. 129 depicts a closely-related synthesis with seven gliders and a block. The 8-glider synthesis combines two of the four-glider units described in this figure.
Berlekamp, E. R.; Conway, John Horton; Guy, Richard K. (2004). Winning ways for your mathematical plays(en inglés) (2ª edición). Natick, Mass: A K Peters. ISBN156881142X. OCLC560267317.